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Old 05-15-2018, 07:18 PM   #1
CRatcliff
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Default 1971 Volvo 144 Exhaust Sheared

Hey all,

On the way home the other day, my exhaust just suddenly completely sheared off at the header. Pictures are linked here: https://imgur.com/a/Lm0fen6

My question is, would getting it welded back at an exhaust shop be the right solution, or is something missing? Looking at this link:

http://212.247.61.152/EU/ZF0001_bild...401030401l.jpg

it looks like it might be missing a hanger of some sort.

But looking at the kit from VP Auto:

http://212.247.61.152/us/main.aspx?p...g&artno=293300

It looks like everything is there, and welding will fix it up. Would love to know what yours looks like and if mine is missing something or is all good.

Thanks all!
--Colin
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Old 05-15-2018, 07:28 PM   #2
hiperfauto
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Most people eliminate the brace at the transmission because the clamp tends to fit loose and rattle. I haven't seen a lot of failures at that joint on cars without the brace so I don't think it's an issue.

How are the rest of the exhaust hangars? What about the motor mounts, are they in good shape?
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Old 05-15-2018, 07:31 PM   #3
CRatcliff
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I think the motor mounts might be a bit of a problem... I replaced a couple of them but the engine does seem to be jiggling a bit. The rest of the hangers should be good. If I take it to an exhaust shop they can probably tell me if it's the hangers, correct?

Short term is probably: weld it up, then take a look at the motor mounts?
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Old 05-15-2018, 07:55 PM   #4
hiperfauto
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Take a look at the motor and trans mounts if they'll let you under the car while the exhaust is being repaired and make sure all the exhaust hangars are in place.
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Old 05-15-2018, 08:49 PM   #5
dl242gt
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You may want to check/replace those mounts before you fix the exhaust. I've had more than one car where the exhaust was done with bad mounts and when the mounts are replaced it put things in a different position causing the exhaust to hit stuff like the drive shaft support crossmember.
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Old 05-16-2018, 01:05 AM   #6
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Oh man okay! I'll definitely look where things are running before doing anything. It all looks pretty clear - after shearing it's still lined up naturally so I don't think it was torqued. Definitely could be motor mounts though. Vibration seems the most likely culprit.
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Old 05-16-2018, 02:32 AM   #7
Lando
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Technically that's not a shear failure but a fatigue failure since it failed right on the weld (heat affected zones usually have higher shear and tensile strengths than annealed but lower fracture toughness). In short the failure was caused by vibration, not exceeding the ultimate stress. Like the others say, check out the mounts, weld it up and call it good.
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Old 05-16-2018, 12:18 PM   #8
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Thanks all!!!
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